5. A model for the number of blankets sold in the t-th week of the year can be modeled by a periodic function, B(t) where B is measured in thousand blankets. The maximum number of blankets sold is 57,000 in the 43rd week of the year, and the minimum number of blankets sold is 13,000 in the 17th week of the year. Use this information to write a model for the number of thousand blankets sold in the t-th week of the year. Describe all steps you take to write this model. Hint: To get you started off correctly, note that B(43) = 57 and B(17) = 13